Skip to main content

Full text of "The Morphology And Evolution Of The Apes And Man"

THE  MUSCULAR  SYSTEM                207
ribs 5-11. The mesial ones fuse, with the pectorali> major, the lateral ones are covered by the latissimus dorsi, and all interdigitate with the serratus nta^nus. The lateral fibres are inserted into the anterior superior iliac spine and outer third of Poupart's ligament. The aponeurosis is inserted into the xiphisternuua, \&*t chondro-sternal junction, pubis and inner two-thirds oi Poupart's ligament. It fuses with the aponeurosis of the internal oblique mesial to the splitting of the latter. Gimbernat's ligament is small, and the aponeurosis :s attached to the fascia lata of the thigh. In the Gorilla it arises from ribs 5-18, mterdigitating with the serratus magnus and latissimus dorsi. In the Orang, with its twelve ribs, the conditions are much as in Man, and Poupart's and Gimbernat's ligaments are well marked.
The internal oblique in the Chimpanzee arises from the outer half of the anterior border of the iliac crest, the anterior superior iliac spine, the outer third of Poupart's ligament, and the lower borders of the tenth to thirteenth costal cartilages. Its aponeurosis has a curved line of splitting, and runs from the tenth costal cartilage to the inner end of Poupart's ligament. In the Gorilla it arises from the inner third of the crista ilii and the outer two-thirds of Poupart's ligament, and from the fascia between the sartorius and scansorius ; and it has an origin from fascia between the sartorius and iliacus in the Orang. Its aponeurosis may not split.
The transversalis abdominis in the Chimpanzee arises from the deep surfaces of ribs 10-13, the lumbar fascia, the anterior quarter of the inner lip of the iliac crest, the inner surface of the anterior superior iliac spine and the outer third of Poupart's ligament; the